Ejector.



M. LEBLANC.

EJECTOR.

APPLICATION, FILED MAY 6,1914.

Patented Mar. 14,1916.

' nzaunrcn anaemic, or vanssnmn, enomes,

norrarron one no AHOE IPQUE Z" EARKS, FNCE,

. for obtaining a high degree of compression and has for its object toconstruct a simple and efiicient apparatus of this kind having perfectstability in operation and also capaisle of easy starting.

In order that the nature of the invention may be clearly understood itwill be described with reference to the accompanying drawing in whichFigure l is a. sectional View of'a. simple form of ejector constructedin accordance with the present invention. Fig. 2 is a diagrammaticsectional View of a modified form of apparatus embodying my invention,and Fig. 3 is a sectional view along the line 3-3 of Fig. 2.

In ejectors of the kind to which the. in- I vention relates the motivefluid is conducted under pressure by one or more nozzles A into achamber .B into which flows from a epipe C the fluid or fiuids to beentrained or ejected; the motive fluid draws these latter by frictioninto the converging-diverging difiuser D opening into a space E atpressure P. The pressure in the chamber 'B nlay be designated by p. Thedimensions'of hedifierent parts of the ejector depend essentially onftheretio-% and the amount-of fluid which is to be passed through. It

will be readily understood therefore that if an ejector is designed toobtain a high degrce of compression in ordinary servicejts dimensionswill not be suitable for startmg or when the pressure p is varied. j

At the moment of starting especially, the steam passing from the nozzlesinto the space at the pressure P has a speed which is very much lessthan when it passes out at thepressure p. the otherhand the den sityofthe entrainedfluid which is also at the pressure P and themes ejected ismuch eater than it is under normal conditions, ence a larger mass offluid-flows into the difi'user at a lower speed. If the neck of thediuser has been calculated for normal operation it. will be too smallfor starting and t will take place with of If,

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on the contrary, the neck is too large for normal operationv the fluidcolumn forced' into the'difl'user will have a contracted sectlon whichis smaller than the neck-of the difiuser, it will therefore no'longerexactly fit the sides of the difiuser and. starting from the moment whenit separates itself from the sides, eddies will be formed whichinterfere with a good output and with the stability of the ejector. lhisobjection would be avoided if the walls of thedirluser could be madeelastic in such a manner as to enable them to mold-themselves at alltimes to the fluid column. This result can be obtained by providingaround the fluid mixture which is forced into the difiu'ser at theplaces where it tends to detach itself from the walls a fluid sheathwhich'willact as an elastic wall and prevent the column from expandingand thus giving rise to eddies. For this purpose at the desired point inthe neighborhood of the neck of the diffuser there is provided as shownon the drawing an annular nozzle which communicates with the space E atthe pressure P, or with a'space where this same pressure P is-existing.'At the moment of starting no fluid passes out of this nozzle but when adifi'erence of pressure is produced between the upper part of theejector and the outlet pressure arises between the outlet of the*difi'user and the neck. The annular nozzle of the di-fiuser acorresponding difierence of 1' increases with the difierence of pressureand the nozzle is adjusted in .such a manner that when normal conditionsare attained the total quantity of fluid passing through the neck,namely motive fluid, ejected 'fluid and fluid discharged by the annular:nozzle H, corresponds with the ensions of the neck. l

en the quantity of ejected fluid diminishcs the pre p tends to diminish,

.the pressure at the neck also diminishes-but the output of the annularnozzle increases so that the quantity of fluid passing through the neckis intained constant. It will be seen that an ejector constructed inthis man- 'ner has, perfect stability, indendent oi the large ratio ofthe compon.

1 It may he-. observed that the quantity of fluid sup to the difiuser bythe annular nozzle can'be very large without impeding the operation: ofthe ejector in any way, be-

to the pressure existing at the lower part of the ejector. The fluiddischarged by the annular nozzle may be air if the difiuser dischargesinto the atmosphere. A

I The annular nozzle may be replaced either by one or severaldistributing nozzles located along the length of the difi'user atsuitable points or by pipes ofsuitable form nozzle for the motive fluid,an inlet for the fluid to be exhausted, a difiuser'having a or by anyother suitable arrangement.

. lln.Figs. 2 and 3 l have illustrated an embodiment of my inventionsimilar to the apparatus illustrated in llig. 1, but in which theannular nozzle His vreplaced. byan annular series of nozzles H the inletends of which are in communication with the region into which theejector exhausts.

While l have illustrated but two embodi- 4 merits of my invention, itwill be apparent to those skilled the art that various changes,substitutions, additions and omissions may be made in the apparatusillustrated without departing from the spirit and scope of the inventionas set forth by the appended claims.

What i claim is: l. in an ejector, the'combination of a v nozzlefor themotive fluid, an inlet for the dll . the difiuser tluid at a;

I portion of the difiuser.

fluid to be exhausted, a converging-diverging diduser and means forintroducing into pressure equal t o that of the ejectedfiuid. r

2. in an ejector, the combination of a nozzle for'the motive fluid, aninlet for the fluid to be exhausted, a diduser 'having a constrictedportion and an admission port for auxiliary fluid adjacent saidconstricted 3; In an ejector, the combination of a nozzle for the motivefluid,.an inlet for the fluid to be exhausted, a difi'user having a neckor constricted portion, and an admission port for auxiliary fluidbetween said nozzleand said neck.

d. In an ejector, the combination of a nozzle for the motive fluid, aninlet for the fluid to be exhausted, a converging-divergingdiduser and apipe connecting the space admitted to said diduser into which thediffuser discharges with a.

portnear the other-end of said difi'user.

5.. In an ejector, the combination of a nozzle tor the motive .fiuid, aninlet for the duid'to be. exhausted, a diffuser having a neck orconstricted portionj'and an annular port through which auxiliary fluidmaybe nozzle and said neck.

nozzle for the motive fluid; an inlet for the fluid: to be exhausted, a'diduser having a. neck or constricted portion, an annular port betweensaid nozzle and saidneck and a pipe acts as an elastic sheath and ntenseneck or constricted ortion, a plurality of nozzles between said nozzleand said neck an nozzles to the space into which-the ejector discharges.1

9. An apparatus of the "character 'described comprising, a chamberhaving an inlet for the fluid to be exhausted, means for delivering'impelling fluid to said chamber,

. a difiuser communicating with the chamber and through which theimpelling and the exhausted fluid (fluid-mixture) passes, and

a pipe connecting said plurality of means for admitting, at the placeswhere the fluid-mixture tends to detach itself from the wall of thedifiuser, a fluid sheath which will act as an'elastic wall and preventthe column of fluid-mixture from expanding.

10. In an ejector, a convergent divergent tube having near one end aninlet for fluid to be exhausted, at least one divergent nozzle fordelivering impelling fluid to the inlet end of said tube, and a' seriesof nozzles for delivering auxiliary fluid to the tube at points. wherethe exhausted and iuipelling fluid (fluid mixture) travers-' ing thetube tends todetach itself from the wall of the tube,-wherebythe'auxiliaryfiuid prevents the fluid mixture from expanding.

ll. In an ejector,-a convergent divergent tube having an inlet for thefluid to be exhausted communicating with theconvergent portionthereofiat least one fluid delivery nozzle for'delivering impellingfluidto the inlet end of said tube,- and, means communi- 1'10 eating with theregion into which said ejector discharges for admitting auxiliary fluidfrom said. region to said tube at the point within the tube where theexhausted and impelling' fluid (fluid mixture) traversing the tube tendsto detach itself from the wall thereof, whereby the auxiliary fluid actsas a filler for the tube and prevents the fluid mixture-from expanding.between said in testimony whereof l have hereunto sub a Y scribed myname this 21st'day of April 1914:. 6.4m an ejector, the combination eta.

I MAURICELEBLANC. Witnesses: j'm- Hanson-C. Com,

